From ed97e374f85b78243fa711c3b695a49b284eb66a Mon Sep 17 00:00:00 2001
From: Clownacy <Clownacy@users.noreply.github.com>
Date: Thu, 20 Feb 2020 13:11:39 +0000
Subject: [PATCH] Fix screen centering in wide/tallscreen

Previously, it would misbehave if the screen is slightly wider than the level
(because it wasn't accounting for the fact that the game hides half of the
border tiles)
---
 src/Frame.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Frame.cpp b/src/Frame.cpp
index 7d8b5339..c14d66e0 100644
--- a/src/Frame.cpp
+++ b/src/Frame.cpp
@@ -37,7 +37,7 @@ void MoveFrame3(void)
 	else
 	{
 		// Widescreen/tallscreen-safe behaviour
-		if (map_w * 16 < WINDOW_WIDTH)
+		if ((map_w - 1) * 16 < WINDOW_WIDTH)
 		{
 			gFrame.x = -(((WINDOW_WIDTH - ((map_w - 1) * 16)) * 0x200) / 2);
 		}
@@ -52,7 +52,7 @@ void MoveFrame3(void)
 				gFrame.x = (((map_w - 1) * 16) - WINDOW_WIDTH) * 0x200;
 		}
 
-		if (map_l * 16 < WINDOW_HEIGHT)
+		if ((map_l - 1) * 16 < WINDOW_HEIGHT)
 		{
 			gFrame.y = -(((WINDOW_HEIGHT - ((map_l - 1) * 16)) * 0x200) / 2);
 		}